Eclipse CPU usage 100 open XML

My Eclipse CPU usage grows to 100% after I try to open XML file.

Eclipse probably ended up with little available memory. Following setup solved my problem.

Open eclipse.ini from Eclipse installation dir. Change all memory variables to sufficient values, especially following items:
--launcher.XXMaxPermSize
256M
-vmargs
-Dosgi.requiredJavaVersion=1.5
-Xms100M
-Xmx512M


Start eclipse with additional parameter:
eclipse.exe ... -vmargs -Xmx256M

You can also start Eclipse in its own VM:
eclipse.exe -vm "C:\Program Files\Java\jdk1.5.0_22\bin\javaw.exe"